# (c) 2017 Red Hat Inc.
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import os
import pty
import subprocess
import sys

from ansible.module_utils._text import to_bytes, to_text
from ansible.module_utils.six.moves import cPickle
from ansible.plugins.connection import ConnectionBase

try:
    from __main__ import display
except ImportError:
    from ansible.utils.display import Display
    display = Display()


class Connection(ConnectionBase):
    ''' Local based connections '''

    transport = 'persistent'
    has_pipelining = False

    def _connect(self):
        self._connected = True
        return self

    def _do_it(self, action):

        master, slave = pty.openpty()
        p = subprocess.Popen(["ansible-connection"], stdin=slave, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        stdin = os.fdopen(master, 'wb', 0)
        os.close(slave)

        # Need to force a protocol that is compatible with both py2 and py3.
        # That would be protocol=2 or less.
        # Also need to force a protocol that excludes certain control chars as
        # stdin in this case is a pty and control chars will cause problems.
        # that means only protocol=0 will work.
        src = cPickle.dumps(self._play_context.serialize(), protocol=0)
        stdin.write(src)

        stdin.write(b'\n#END_INIT#\n')
        stdin.write(to_bytes(action))
        stdin.write(b'\n\n')

        (stdout, stderr) = p.communicate()
        stdin.close()

        return (p.returncode, stdout, stderr)

    def exec_command(self, cmd, in_data=None, sudoable=True):
        super(Connection, self).exec_command(cmd, in_data=in_data, sudoable=sudoable)
        return self._do_it('EXEC: ' + cmd)

    def put_file(self, in_path, out_path):
        super(Connection, self).put_file(in_path, out_path)
        self._do_it('PUT: %s %s' % (in_path, out_path))

    def fetch_file(self, in_path, out_path):
        super(Connection, self).fetch_file(in_path, out_path)
        self._do_it('FETCH: %s %s' % (in_path, out_path))

    def close(self):
        self._connected = False

    def run(self):
        """Returns the path of the persistent connection socket.

        Attempts to ensure (within playcontext.timeout seconds) that the
        socket path exists. If the path exists (or the timeout has expired),
        returns the socket path.
        """
        rc, out, err = self._do_it('RUN:')
        return to_text(out, errors='surrogate_or_strict')
